I read in this thread about a Gen 3 witout the rail and without hand grooves. I live in MA and I own a 3 pin glock 23 that does not have a light rail or finger grooves on the front of the frame und the trigger guard. I had to add an aftermarket rubber hand grip to get the finger bumps.

That is a Gen 2. The "third pin" was added to handle the .40 round.

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